There are 2 types of currency used in Cuba. The one used by the common people are called pesos. In the city, CUC is more often used, even though it was originally created to help foreigners change their money. Usually 1 USD = 1 CUC. However, it's better to bring Euros to exchange, because by law, US dollars are charged a 15% tariff. That's why I changed my dollars to Euros before coming to Cuba. But don't make my mistake of changing into too many pesos. I thought I would use a lot more of them, but even in non-tourist areas, CUC is the standard, even at restaurants.You can't go to a regular bank, and hotel rates suck. So go to a CADECA.

Cuban pesos, worth very little. good for food.

Peso coins almost worthless, but don't get them confused with CUC coins